Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 2: Altermagnets I
MA 2.3: Talk
Monday, March 9, 2026, 10:00–10:15, HSZ/0004
Spin demons in d-wave altermagnets — •Pieter Gunnink1, Jairo Sinova1, and Alexander Mook2 — 1Institute of Physics, Johannes Gutenberg University Mainz, Staudingerweg 7, Mainz 55128, Germany — 2University of Münster, Institute of Solid State Theory, 48149 Münster, Germany
Demons are a type of plasmons, which consist of out-of-phase oscillations of electrons in different bands. Here, we show that d-wave altermagnets, a recently discovered class of collinear magnetism, naturally realize a spin demon, which consists of out-of-phase movement of the two spin species [1]. The spin demon lives outside of the particle-hole continuum of one of the spin species, and is therefore significantly underdamped, reaching quality factors of > 10. We show that the spin demon carries a magnetic moment, which inherits the d-wave symmetry. Finally, we consider both three and two dimensional d-wave altermagnets, and show that spin demons exists in both.
[1] Gunnink, Sinova, Mook, Phys. Rev. Lett. 135, 126701 (2025)
Keywords: Plasmons; Pines' Demon; Altermagnets